Therefore - Crossword Clue, Answer and Explanation

I've seen this clue in The Guardian, the Penny Press, the Sydney Morning Herald, The Independent, the Universal, the Evening Standard, the USA Today, the LA Times, the King Feature Syndicate, the Newsday, The Times, The Wall Street Journal, The Mirror, The Telegraph and The Star Tribune.

'therefore' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for thus that I've seen before include "In this way" , "as indicated" , "an original Christmas gift" , "It follows" , "Therefore, hence" .)

I've seen this clue in The Washington Post, the LA Times, the Newsday, The Telegraph, The Star Tribune, the Evening Standard, the USA Today, the Newsday.com, The Times, The Mirror, The New York Times, The Independent, The Sun, The Guardian, the Penny Press, the Sydney Morning Herald, the Universal, the King Feature Syndicate and The Wall Street Journal.

'therefore' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ergo that I've seen before include "Thus" , "Consequently" , "'Cogito, ---- sum'" , "so philosopher wrote in Latin" , "It follows" .)

I've seen this clue in The Washington Post, the LA Times, the Newsday, The Telegraph, The Star Tribune, the Evening Standard, the USA Today, the Newsday.com, The Times, The Mirror, The New York Times, The Independent, The Sun, The Guardian, the Penny Press, the Sydney Morning Herald, the Universal, the King Feature Syndicate and The Wall Street Journal.

'therefore' is the definition.
('so' can mean 'consequently' or 'therefore')

This is the entire clue.

I've seen this clue in the King Feature Syndicate.

Therefore (5)